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Selective hydrogenation method of highly unsaturated hydrocarbons in cracking gas

A technology for selective hydrogenation and cracking gas, used in the processing of gas mixtures, hydrocarbon oil treatment, petroleum industry, etc., can solve the problems of high conversion rate, reduce the number of reaction units, increase life, improve selectivity and safety sexual effect

Active Publication Date: 2010-09-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem in the prior art that acetylene and alkynes containing more carbon atoms and diolefins have a higher conversion rate, the inventors have conducted in-depth and meticulous research and proposed a method for the production of olefins from olefin production units. Selective hydrogenation of C2-C10 highly unsaturated hydrocarbons including acetylene in the product stream can overcome the above-mentioned shortcomings of the prior art

Method used

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  • Selective hydrogenation method of highly unsaturated hydrocarbons in cracking gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Preparation of nickel-molybdenum-zinc / alumina catalyst

[0065] The alumina-supported BC-H-2008 catalyst containing 15% Ni, 1% Mo and 1% Zn was prepared by equal volume impregnation method. Dissolving an appropriate amount of nickel nitrate, ammonium molybdate and zinc nitrate in water to prepare a solution, then impregnating the alumina support in the solution, drying, calcining and reducing to obtain the required non-precious metal catalyst.

[0066] (2) Preparation of palladium / alumina catalyst

[0067] The alumina-supported BC-L-83A catalyst containing 0.1% Pd was prepared by equal volume impregnation method. The alumina carrier is immersed in palladium solution, dried, calcined and reduced to obtain the required noble metal catalyst.

[0068] (3) Selective hydrogenation of cracked gas

[0069] see figure 1 , the gas phase raw material 1 containing olefins obtained from the steam cracking unit, the specific composition can refer to the following table 1, mix...

Embodiment 2

[0075] Utilize the olefin-containing gas phase stream obtained from the steam cracking unit as raw material, the specific composition of the stream is the same as in Example 1, mixed with the liquid phase stream coming from the bottom of the debutanizer, then heat exchanged in a heat exchanger, and enter Mixed Phase Hydrogenation Reactor 1. Mixed-phase hydrogenation reactor 1 is filled with palladium catalyst, Ni catalyst (two kinds of catalysts are produced by China Petroleum and Chemical Corporation Beijing Research Institute of Chemical Industry) and upper layer of Ni catalyst and lower layer of palladium catalyst (catalyst combination). The mixed-phase selective hydrogenation reaction test of highly unsaturated hydrocarbons in cracked gas was carried out under different conditions. The reaction conditions were: reaction pressure 2.0MPa, reaction inlet temperature 65°C, gas hourly volume space velocity 3000h -1 , Liquid hourly volume space velocity 7.5h -1 , and the evalua...

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Abstract

The invention discloses a selective hydrogenation method of cracking gas, belongs to the technical field of selective hydrogenation of unsaturated hydrocarbons, aims at solving the problem that the prior art does not have higher conversion rate for both acetylene and alkynes and dienes containing more carbon atoms and provides a method for carrying out selective hydrogenation on the C2-C10 highlyunsaturated hydrocarbons (alkynes and dienes) on the upstream side of a front dethanizer of an olefin production device with the adoption of acting liquid phase flow of substrate flow of the dethanizer, which is characterized by loading a non-noble metal catalyst in an upper layer in a reactor for carrying out the hydrogenation on the alkynes and the dienes of C3 and above, and loading a noble metal catalyst in a lower layer for carrying out the selective hydrogenation on the acetylene. The method can carry out the hydrogenation on the alkynes and the dienes in the cracking gas as far as possible, simultaneously fully play the role of the liquid phase flow of the mixed phase hydrogenation reactor, reduce the feed rate entering into the front dethanizer, reduce the energy consumption and the equipment investment and be conductive to improving the selectivity.

Description

technical field [0001] The present invention relates to a method for the selective hydrogenation of alkynes and dienes, more specifically, the present invention relates to a method for the selective hydrogenation of alkynes and dienes in cracked gas from an olefin production unit. Background technique [0002] Unless otherwise specified, the highly unsaturated hydrocarbons mentioned in the present invention refer to hydrocarbons containing triple bonds or two double bonds. [0003] Processes for the conversion of hydrocarbons at high temperatures, such as steam thermal cracking or catalytic cracking, to provide unsaturated hydrocarbons such as ethylene, acetylene, propylene, butadiene, butene; saturated alkanes such as ethane, propane, butane; There are also light components such as methane, hydrogen and carbon monoxide and hydrocarbons with a boiling point in the gasoline range. The gas-phase monoolefins with more than two carbon atoms obtained by these processes also cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/02
Inventor 戴伟田保亮彭晖唐国旗穆玮乐毅李宝芹张齐
Owner CHINA PETROLEUM & CHEM CORP
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